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/* GSM/GPRS/3G authentication core infrastructure */
/* (C) 2010-2011 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <errno.h>
#include <stdint.h>
#include <string.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/plugin.h>
#include <osmocom/crypt/auth.h>
static LLIST_HEAD(osmo_auths);
static struct osmo_auth_impl *selected_auths[_OSMO_AUTH_ALG_NUM];
/* register a cipher with the core */
int osmo_auth_register(struct osmo_auth_impl *impl)
{
if (impl->algo >= ARRAY_SIZE(selected_auths))
return -ERANGE;
llist_add_tail(&impl->list, &osmo_auths);
/* check if we want to select this implementation over others */
if (!selected_auths[impl->algo] ||
(selected_auths[impl->algo]->priority > impl->priority))
selected_auths[impl->algo] = impl;
return 0;
}
/* load all available GPRS cipher plugins */
int osmo_auth_load(const char *path)
{
/* load all plugins available from path */
return osmo_plugin_load_all(path);
}
int osmo_auth_supported(enum osmo_auth_algo algo)
{
if (algo >= ARRAY_SIZE(selected_auths))
return -ERANGE;
if (selected_auths[algo])
return 1;
return 0;
}
int osmo_auth_gen_vec(struct osmo_auth_vector *vec,
struct osmo_sub_auth_data *aud,
const uint8_t *_rand)
{
struct osmo_auth_impl *impl = selected_auths[aud->algo];
int rc;
if (!impl)
return -ENOENT;
rc = impl->gen_vec(vec, aud, _rand);
if (rc < 0)
return rc;
memcpy(vec->rand, _rand, sizeof(vec->rand));
return 0;
}
int osmo_auth_gen_vec_auts(struct osmo_auth_vector *vec,
struct osmo_sub_auth_data *aud,
const uint8_t *rand_auts, const uint8_t *auts,
const uint8_t *_rand)
{
struct osmo_auth_impl *impl = selected_auths[aud->algo];
if (!impl || !impl->gen_vec_auts)
return -ENOENT;
return impl->gen_vec_auts(vec, aud, rand_auts, auts, _rand);
}
static const struct value_string auth_alg_vals[] = {
{ OSMO_AUTH_ALG_NONE, "None" },
{ OSMO_AUTH_ALG_COMP128v1, "COMP128v1" },
{ OSMO_AUTH_ALG_COMP128v2, "COMP128v2" },
{ OSMO_AUTH_ALG_COMP128v3, "COMP128v3" },
{ OSMO_AUTH_ALG_XOR, "XOR" },
{ OSMO_AUTH_ALG_MILENAGE, "MILENAGE" },
{ 0, NULL }
};
const char *osmo_auth_alg_name(enum osmo_auth_algo alg)
{
return get_value_string(auth_alg_vals, alg);
}
enum osmo_auth_algo osmo_auth_alg_parse(const char *name)
{
return get_string_value(auth_alg_vals, name);
}
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